1. And these will ply the short wings with such irresistible power that they can bore for long distances through an opposing gale before exhaustion follows.
    这些肌肉以巨大的力量扇动短小的翅膀，使这类鸟能顶着大风飞行很远的路才会疲劳。

2. All natural systems tend toward balance among opposing factors or forces.
    所有自然体系都趋向于在各种对立因素或力量中保持平衡。